Fix build with newer GCC.

Taken from upstream:

  https://sourceforge.net/p/libwpd/code/ci/333c8a26f231bea26ec3d56245315041bbf5577f/

--- a/src/lib/WPXTable.h
+++ b/src/lib/WPXTable.h
@@ -53,7 +53,7 @@
 	~WPXTable();
 	void insertRow();
 	void insertCell(unsigned char colSpan, unsigned char rowSpan, unsigned char borderBits);
-	const WPXTableCell  *getCell(size_t i, size_t j)
+	const WPXTableCell  *getCell(std::size_t i, std::size_t j)
 	{
 		return &(m_tableRows[i])[j];
 	}
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<tr><td><span title='2023-09-21 20:36:13 +0200'>2023-09-21</span></td><td><a href='/guix/commit/gnu/packages/patches/openjdk-21-fix-rpath.patch?id=ec8c5d027f87bb39ce3fd03c40a13d7b316d9dac'>gnu: Add openjdk@21.</a><span class='msg-avail'>...</span></td><td>Danny Milosavljevic</td></tr>